Visit our new website

Understanding Hashimoto's Encephalopathy 2016 Edition:
An Expanded and Updated Guide For Patients, Families, and Caregivers
– Now Available on Amazon
Follow us on Facebook, Twitter, LinkedIn, Pinterest, and Instagram!

Tests and diagnosis


By definition, lab results for HE patients must show elevated thyroid antibodies – including anti-thyroid peroxidase antibodies (anti-TPO), anti-thyroid microsomal antibodies (anti-M), and/or antithyroglobulin antibodies (anti-Tg).  Notably, however, studies show that the titre (concentration) of elevated antibodies does not correlate with the severity of symptoms. The presence of significantly elevated thyroid antibody levels is considered to be merely a marker of HE, not the cause of the patient’s symptoms. Although testing for elevated antibodies is usually based on serum, these elevated antibody levels are occasionally also present in cerebral spinal fluid (CSF) as well.

HESA  interviewed neurologist Dr. Elzbieta Wirkowski and asked, “What criteria do you use to
recognize HE in clinical practice?

Dr. Wirkowski:
I have seen a wide variety of clinical presentations in HE, and now routinely screen both my hospital and clinic patients for antithyroid antibodies. The profile that would trigger me to consider a course of immunotherapy would be a patient with a relatively normal thyroid function test, highly elevated thyroid antibody levels, and unexplained neurological or psychiatric symptoms. A positive response to immunotherapy would further support the diagnosis.


Recently, a number of scientists have studied serum autoantibodies against the NH2-terminal of a-enolase (NAE), which appear to hold promise as a specific diagnostic marker for HE, although this research is limited and tests for these autoantibodies are only available from a handful of laboratories in the world.

Learn more here:


The electroencephalogram studies of HE patients are usually abnormal (up to 90% of cases), but they are almost always non-diagnostic findings. The most common findings are diffuse or generalized slowing, or frontal intermittent rhythmic delta activity (FIRDA). Prominent triphasic waves, focal slowing, epileptiform abnormalities, photoparoxysmal and photomyogenic responses are occasionally seen.


Magnetic resonance imaging (MRI) and computed tomography (CT) scans are frequently normal in those with HE/SREAT. Single-photon emission computed tomography (SPECT) scans often disclose hypoperfusion, and positron emission tomography (PET) scans often disclose hypometabolism.  The results of PET scans, in particular, are often a deciding factor in confirming the diagnosis.


Last edited by Web Team on June 20th, 2016

Giving Assistant

Donate to HESA via Giving Assistant when you shop online.


Find Our Page On The Mighty

More than half of Americans are facing serious health conditions or medical issues. They want more than information. They want to be inspired. The Mighty publishes real stories about real people facing real challenges.


AE Alliance
"The Autoimmune Encephalitis Alliance promotes collaboration to improve care, find a cure and create community so that no one faces autoimmune encephalitis alone.

The Encephalitis Society
"The Encephalitis Society is an International organization providing information and support for all causes of Encephalitis."

Encephalitis Global
"Encephalitis Global is a U.S.A. 501(c)(3) non-profit organization formed in 2005 as an alliance connecting encephalitis survivors and caregivers around the world."

Scientific literature is growing at a rate of more than 2 new articles every single minute. It is impossible for scientists to consume and understand the rapidly expanding ocean of biomedical literature. You can help biomedical researchers find the information they need to discover cures faster.
"Connecting Rare Disease Patients Globally"
"Alone we are rare. Together we are strong.®"

Contact a Family
"For families with disabled children."

Madison's Foundation Provides information about rare diseases and connects parents whose children have the same rare disease.

NIH Health Hotline
Toll-free numbers from the National Library of Medicine's Health Hotlines Database.

HE Notebook - Wordpress Site
A great blog of an HE patient with a trove of information, personal stories, and links to medical studies.